Claiming that one can meaningfully express free speech without relying on corporations is delusion.

If you aren't wielding the megaphone that is twitter/fb/youtube/whatever, then you are not going to be heard. That's just a fact at this point. Social media has in fact lowered the barrier to entry for expressing speech to large audiences, because before social media there were only newspapers and TV networks that cost significantly more and had significantly more preference towards specific agendas.

I understand the ideological desire for that not to be the case, and maybe society could stop and think how to fulfil that desire, but ignoring the facts of today is not constructive at all.